20×12= | 90×15= | 24×20= | 300×6= | 900÷3= |
150÷5= | 60÷4= | 450÷45= | 780×0= |
解:20×12=240, | 90×15=1350, | 24×20=480, | 300×6=1800, | 900÷3=300, |
150÷5=30, | 60÷4=15, | 450÷45=10, | 780×0=0. |
分析:根據(jù)整數(shù)乘除法的計算方法進行計算即可.
點評:口算時,注意運算符號和數(shù)據(jù),然后再進一步計算即可.
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